Of course, legroom matters all that much more on international flights. And the winner in this arena: Aeromexico, at 34 inches. South African Airways gives 33.5 inches of space, earning it the title of "second-most tolerable," while Asiana, Air India, and Air Tahiti Nui also come in above average, offering 33 inches.
A few international airlines are notoriously cramped, including Air Berlin, Austrian Airlines, and Aeroflot, who give the minimum 30 inches. Maybe avoid these guys if you don't want your knees continually knocking against the seat in front of you. If you like that sort of thing, though, book away!
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Kara King is a News Writer for Thrillist and has been cramped for most of her life. Send news tips to firstname.lastname@example.org and follow her tweets from small spaces at @karatillie.